Method for monitoring greenhouse gas stratification in semi-underground wastewater treatment plant and device thereof

Abstract

The application provides a greenhouse gas layered monitoring method and device for a semi-underground sewage treatment plant, wherein the method comprises the following steps: monitoring greenhouse gases of a layered underground pool body, a ground gas accumulation area, a ground open pool body and a deodorizing device of the semi-underground sewage treatment plant, and collecting the monitoring results of each layer; analyzing the collected monitoring results of each layer, and outputting the analysis results. Through the layered monitoring of different areas (the underground pool body, the ground gas accumulation area, the ground open pool body and the deodorizing device) of the sewage treatment plant, the greenhouse gas emission characteristics of each area can be accurately captured, the overall monitoring of all key areas is ensured, the collected monitoring results of each layer are analyzed, the analysis results are outputted, the basis for formulating more accurate emission reduction measures for the semi-underground sewage treatment plant is provided, and the effect of greenhouse gas emission control is improved.

Description

Technical Field

[0001] This invention relates to the field of greenhouse gas monitoring technology, and in particular to a method and apparatus for stratified monitoring of greenhouse gases in a semi-underground wastewater treatment plant. Background Technology

[0002] In semi-underground wastewater treatment plants, the unique structure of the underground tanks and surface gas accumulation areas exacerbates problems such as uneven gas accumulation and diffusion. This complex gas distribution means that traditional single monitoring methods often fail to capture the greenhouse gas emission characteristics of each area, thus affecting the effectiveness of greenhouse gas emission control.

[0003] Existing monitoring schemes each have different focuses, but all generally have certain limitations. For example, Scheme 1 (CN119534755 A) monitors gas emissions from open reaction tanks by deploying monitoring points along the wastewater treatment path and installing floating gas collection devices, but it does not take into account the complex gas distribution in semi-underground wastewater treatment plants. Scheme 2 (CN119334431A) uses gas flow rate and gas concentration monitoring devices in the process units of the wastewater treatment plant to achieve statistical analysis of greenhouse gas emissions throughout the entire process, but it still fails to solve the monitoring problem of uneven gas accumulation in semi-underground structures. Scheme 3 (CN118817638A) analyzes gas samples using online optical analysis devices, but this method may be difficult to adapt to the uneven gas distribution in complex semi-underground structures. Scheme 4 (application number CN116990453B) monitors greenhouse gas emissions from the wastewater treatment process through front-end monitoring modules and data processing modules. Although it can monitor the entire process, it may still not be able to fully adapt to the complex situation of uneven gas distribution in semi-underground wastewater treatment plants.

[0004] Therefore, a new monitoring technology and solution is urgently needed for greenhouse gas monitoring of semi-underground wastewater treatment plants to more accurately reflect their emission characteristics and optimize emission control. Summary of the Invention

[0005] One of the objectives of this invention is to provide a method for stratified monitoring of greenhouse gases in semi-underground wastewater treatment plants, in order to address the shortcomings of the prior art.

[0006] The greenhouse gas stratification monitoring method for semi-underground wastewater treatment plants provided in this embodiment of the invention includes:

[0007] Greenhouse gas monitoring was conducted at different levels for the underground pools, surface gas accumulation areas, open surface pools, and deodorization devices of the semi-underground wastewater treatment plant, and the monitoring results of each level were summarized.

[0008] Analyze the summarized monitoring results from each layer and output the analysis results.

[0009] Optionally, the steps for monitoring greenhouse gases in underground pools are as follows:

[0010] The sampling end of the portable infrared gas analyzer is controlled to move downwards at a constant speed and vertically from the observation window of the underground pool.

[0011] During the movement, the depth scan of the layers accessed within the underground pool is performed at preset time intervals.

[0012] After the movement is completed, summarize the depth scan results for each layer;

[0013] Based on the aggregated depth scan results for each layer, the average concentration and instantaneous gas release rate for each layer were calculated.

[0014] The mass emission rate is calculated based on the stratified average concentration and the instantaneous gas release rate.

[0015] Optionally, the steps for monitoring greenhouse gases in areas where they accumulate on the ground are as follows:

[0016] Plan the navigation routes of mobile monitoring vehicles deployed in the ground gas accumulation area;

[0017] Based on the mobile monitoring route, control the mobile monitoring vehicle to monitor greenhouse gases in areas where ground gases accumulate.

[0018] Optionally, the steps for monitoring greenhouse gases in open-air ground-level pools are as follows:

[0019] Based on flux chamber monitoring, greenhouse gas emission fluxes of open-top ponds were obtained.

[0020] Calculate the greenhouse gas emissions of an open-top pond based on the greenhouse gas emission flux and the surface area of ​​the open pond.

[0021] Optionally, the steps for monitoring greenhouse gases in the deodorization device are as follows:

[0022] Monitor the gas concentration, flow velocity, and cross-sectional area of ​​the pipe at the monitoring point of the straight pipe section at the outlet of the deodorization device;

[0023] Calculate the greenhouse gas emissions of the deodorization device based on gas concentration, flow rate, and pipe cross-sectional area.

[0024] Optionally, the steps for analyzing the summarized monitoring results from each layer are as follows:

[0025] The total emissions were determined by analyzing and summarizing the monitoring results from each level.

[0026] Optionally, the steps for analyzing the summarized monitoring results from each layer are as follows:

[0027] Based on the aggregated monitoring results from each level, the spatial distribution of greenhouse gases is constructed;

[0028] Decisions on optimal emission reduction pathways are made based on the spatial distribution of greenhouse gases.

[0029] Optionally, the steps for analyzing the summarized monitoring results from each layer are as follows:

[0030] Based on the aggregated monitoring results from each layer, the collection efficiency of the deodorization device is estimated.

[0031] Optionally, the portable infrared gas analyzer is equipped with a dehumidification device at its gas sampling end.

[0032] The greenhouse gas stratification monitoring method for semi-underground wastewater treatment plants provided in this embodiment of the invention includes:

[0033] The stratified greenhouse gas monitoring module is used to monitor greenhouse gases in the underground pools, surface gas accumulation areas, open surface pools, and deodorization devices of a semi-underground wastewater treatment plant, and to summarize the monitoring results of each layer.

[0034] The monitoring results analysis module is used to analyze the summarized monitoring results from each level and output the analysis results.

[0035] Optionally, the steps for monitoring greenhouse gases in underground pools are as follows:

[0036] The sampling end of the portable infrared gas analyzer is controlled to move downwards at a constant speed and vertically from the observation window of the underground pool.

[0037] During the movement, the depth scan of the layers accessed within the underground pool is performed at preset time intervals.

[0038] After the movement is completed, summarize the depth scan results for each layer;

[0039] Based on the aggregated depth scan results for each layer, the average concentration and instantaneous gas release rate for each layer were calculated.

[0040] The mass emission rate is calculated based on the stratified average concentration and the instantaneous gas release rate.

[0041] Optionally, the steps for monitoring greenhouse gases in areas where they accumulate on the ground are as follows:

[0042] Plan the navigation routes of mobile monitoring vehicles deployed in the ground gas accumulation area;

[0043] Based on the mobile monitoring route, control the mobile monitoring vehicle to monitor greenhouse gases in areas where ground gases accumulate.

[0044] Optionally, the steps for monitoring greenhouse gases in open-air ground-level pools are as follows:

[0045] Based on flux chamber monitoring, greenhouse gas emission fluxes of open-top ponds were obtained.

[0046] Calculate the greenhouse gas emissions of an open-top pond based on the greenhouse gas emission flux and the surface area of ​​the open pond.

[0047] Optionally, the steps for monitoring greenhouse gases in the deodorization device are as follows:

[0048] Monitor the gas concentration, flow velocity, and cross-sectional area of ​​the pipe at the monitoring point of the straight pipe section at the outlet of the deodorization device;

[0049] Calculate the greenhouse gas emissions of the deodorization device based on gas concentration, flow rate, and pipe cross-sectional area.

[0050] Optionally, the steps for analyzing the summarized monitoring results from each layer are as follows:

[0051] The total emissions were determined by analyzing and summarizing the monitoring results from each level.

[0052] Optionally, the steps for analyzing the summarized monitoring results from each layer are as follows:

[0053] Based on the aggregated monitoring results from each level, the spatial distribution of greenhouse gases is constructed;

[0054] Decisions on optimal emission reduction pathways are made based on the spatial distribution of greenhouse gases.

[0055] Optionally, the steps for analyzing the summarized monitoring results from each layer are as follows:

[0056] Based on the aggregated monitoring results from each layer, the collection efficiency of the deodorization device is estimated.

[0057] Optionally, the portable infrared gas analyzer is equipped with a dehumidification device at its gas sampling end.

[0058] The present invention has achieved the following beneficial effects:

[0059] By conducting stratified monitoring of different areas of a wastewater treatment plant (underground tanks, surface gas accumulation areas, open surface tanks, and deodorization devices), the greenhouse gas emission characteristics of each area can be accurately captured, ensuring comprehensive monitoring of all key areas. The collected monitoring results from each layer can be analyzed and output, providing a basis for developing more precise emission reduction measures for semi-underground wastewater treatment plants and improving the effectiveness of greenhouse gas emission control.

[0060] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0061] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0062] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0063] Figure 1 This is a schematic diagram of a greenhouse gas stratification monitoring method for a semi-underground wastewater treatment plant in an embodiment of the present invention;

[0064] Figure 2 This is a schematic diagram of the high nitrous oxide emission area detected near the pretreatment and biochemical treatment sections in an embodiment of the present invention;

[0065] Figure 3 This is a schematic diagram of a greenhouse gas stratification monitoring system for a semi-underground wastewater treatment plant, as described in an embodiment of the present invention. Detailed Implementation

[0066] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0067] Example 1:

[0068] This invention provides a method for stratified monitoring of greenhouse gases in semi-underground wastewater treatment plants, such as... Figure 1 As shown, it includes:

[0069] Greenhouse gas monitoring was conducted at different levels for the underground pools, surface gas accumulation areas, open surface pools, and deodorization devices of the semi-underground wastewater treatment plant, and the monitoring results of each level were summarized.

[0070] Analyze the summarized monitoring results from each layer and output the analysis results.

[0071] This invention enables the accurate capture of greenhouse gas emission characteristics in different areas of a wastewater treatment plant (underground pools, surface gas accumulation areas, open surface pools, and deodorization devices) through stratified monitoring. This ensures comprehensive monitoring of all key areas, analyzes the collected monitoring results from each layer, and outputs the analysis results. This provides a basis for developing more precise emission reduction measures for semi-underground wastewater treatment plants, thereby improving the effectiveness of greenhouse gas emission control.

[0072] Example 2:

[0073] In one embodiment, the steps for monitoring greenhouse gases in an underground pool are as follows:

[0074] The sampling end of the portable infrared gas analyzer is controlled to move downwards at a constant speed and vertically from the observation window of the underground pool.

[0075] During the movement, the depth scan of the layers accessed within the underground pool is performed at preset time intervals.

[0076] After the movement is completed, summarize the depth scan results for each layer;

[0077] Based on the aggregated depth scan results for each layer, the average concentration and instantaneous gas release rate for each layer were calculated.

[0078] The mass emission rate is calculated based on the stratified average concentration and the instantaneous gas release rate.

[0079] The formulas for calculating the stratified average concentration and the instantaneous gas release rate are as follows:

[0080]

[0081] Among them, C avg For the stratified average concentration, C i V represents the gas concentration in the i-th layer. i V represents the process unit volume of the i-th layer. total is the total volume of the process section, and n is the number of vertical layers;

[0082]

[0083] Among them, Q gas The instantaneous gas release rate, denoted as aeration volume, and a and b as empirical coefficients.

[0084] The formula for calculating the mass emission rate is as follows:

[0085] Mass emission rate = C avg ×Q gas

[0086] Calculation example:

[0087] Taking a semi-underground wastewater treatment plant as an example, its biological treatment reaction tank is constructed underground, with observation windows installed on the ground to monitor the wastewater treatment process in the aerobic stage. When monitoring nitrous oxide emissions through the observation windows, the bottom concentration C1 was found to be 0.005 kg / m³. 3 The volume percentage is 35%; the concentration in the middle part, C2, is 0.002 kg / m³. 3 Volume percentage: 35%; Top concentration C3 = 0.002 kg / m³ 3 It accounts for 30% of the volume.

[0088] Correct the aeration rate to Q gas =500m 3 / h;

[0089] The volume-weighted average concentration is C avg =0.005×0.35+0.002×0.35+0.002×0.3=0.00305kg / m 3 ;

[0090] The mass emission rate is 0.00305 × 500 = 1.52 kg / h.

[0091] The observation window monitoring of the underground pool adopts a non-invasive method to avoid damaging the airtightness of the underground structure. The specific monitoring steps are as follows: First, a portable infrared gas analyzer is prepared for real-time monitoring of greenhouse gas concentrations, and a dehumidifier is added at the front end of the sampling port to reduce the interference of water vapor on gas detection and instrument operation. One end of the polytetrafluoroethylene (PTFE) gas collection pipeline is connected to the dehumidifier, and the other end serves as the gas sampling end. During monitoring, for the biochemical treatment section of the semi-underground wastewater treatment plant, the observation window is set in different areas (such as aerobic, anoxic, and anaerobic zones), and the gas concentration is detected using a non-invasive, stratified dynamic monitoring method. The gas sampling pipeline extends deep through the observation window and moves downwards at a uniform speed and vertically via a slide rail, completing a 0-5 meter depth scan every 5 minutes. The specific monitoring time and depth can be adjusted according to the actual conditions of the plant area.

[0092] Example 3:

[0093] In one embodiment, the steps for monitoring greenhouse gases in areas where gases accumulate on the ground are as follows:

[0094] Plan the navigation routes of mobile monitoring vehicles deployed in the ground gas accumulation area;

[0095] Based on the mobile monitoring route, control the mobile monitoring vehicle to monitor greenhouse gases in areas where ground gases accumulate.

[0096] Ground-based gas accumulation monitoring employs a mobile monitoring method to analyze the distribution of greenhouse gas concentrations within the plant area and identify high-emission sources. Specific operational steps include: first, deploying a mobile monitoring vehicle equipped with an onboard greenhouse gas analyzer, meteorological monitoring system, and satellite positioning system; then, conducting preliminary data collection and investigation to confirm meteorological conditions and collect information on greenhouse gas emission sources within the wastewater treatment plant area, such as the geographical location of the pollution sources, treatment processes, collection and purification devices, and emission outlet locations; next, planning the mobile monitoring route, considering the distribution of greenhouse gas emission sources, prevailing wind direction, and plant management requirements, and monitoring as close to the emission sources as possible; before implementing mobile monitoring, starting the equipment and conducting a small-scale mobile test to ensure normal equipment and instrument operation and no significant data delay. During actual monitoring, the mobile vehicle operates at a speed not exceeding 10 km / h, capable of collecting effective data within a range of approximately 15 meters. When encountering a significant increase in concentration, the vehicle is immediately stopped for fixed-point monitoring, and the average monitoring value for that area is recorded. Finally, by analyzing monitoring data, the source of greenhouse gases is determined, confirming whether it is direct emission from the deodorization device, fugitive emission due to leakage or escape, or an abnormally high emission area formed by obstructed diffusion. Figure 2 As shown, taking a semi-underground sewage treatment plant as an example, during ground area mobile monitoring, the emission distribution of nitrous oxide was measured. Areas A and B are high emission areas of nitrous oxide, located downwind of the odor treatment devices in the pretreatment section and the biochemical treatment section, respectively, indicating that there are no unorganized emissions such as leaks or escapes in the plant.

[0097] Example 4:

[0098] In one embodiment, the steps for monitoring greenhouse gases in an open-top surface pool are as follows:

[0099] Based on flux chamber monitoring, greenhouse gas emission fluxes of open-top ponds were obtained.

[0100] Calculate the greenhouse gas emissions of an open-top pond based on the greenhouse gas emission flux and the surface area of ​​the open pond.

[0101] The formula for calculating greenhouse gas emissions from open-air ground-level pools is as follows:

[0102] Q open·tanks =ER tank ×S tank

[0103] Among them, Q open·tanks For greenhouse gas emissions from open-air ground-level pools, ER tank S represents greenhouse gas emission flux. tank The surface area of ​​the open pool.

[0104] Calculation example:

[0105] Taking a semi-underground wastewater treatment plant as an example, there is an open secondary sedimentation tank without centralized gas collection and treatment. Therefore, the total nitrous oxide emission from the secondary sedimentation tank, measured using the flux chamber method, is 0.0002 g / m³. 2 h×20000m 2 = 4g / h.

[0106] Example 5:

[0107] In one embodiment, the steps for monitoring greenhouse gases in the deodorization device are as follows:

[0108] Monitor the gas concentration, flow velocity, and cross-sectional area of ​​the pipe at the monitoring point of the straight pipe section at the outlet of the deodorization device;

[0109] Calculate the greenhouse gas emissions of the deodorization device based on gas concentration, flow rate, and pipe cross-sectional area.

[0110] The formula for calculating greenhouse gas emissions is as follows:

[0111] Q gas =C×V×A×3600×10 ﹣6

[0112] Among them, Q gas Where C is the greenhouse gas emission, V is the gas concentration, and A is the flow velocity.

[0113] Calculation example:

[0114] Taking a semi-underground wastewater treatment plant as an example, both its pretreatment and biological treatment sections are equipped with deodorization devices. After testing, the calculated discharge rates were 0.041 kg / h and 1.75 kg / h, respectively.

[0115] The odor control device is monitored by detecting greenhouse gases and their flow rates in the exhaust pipe downstream of the device. The specific steps include: First, preheating the greenhouse gas analyzer and pitot tube flow meter one hour in advance; then, selecting appropriate locations on the straight pipe section at the odor control device outlet to set up monitoring points, avoiding bends, valves, and other turbulent areas; next, connecting the gas analyzer, dryer, and sampling probe, ensuring the gas path length does not exceed 3 meters, and simultaneously collecting greenhouse gas concentrations (1Hz) and flow rates (1Hz) for at least 5 minutes of continuous monitoring; finally, performing quality control on the data, removing outliers such as concentration fluctuations exceeding 3σ or flow rate fluctuations exceeding 20%.

[0116] Example 6:

[0117] In one embodiment, the steps for analyzing the summarized monitoring results from each layer are as follows:

[0118] The total emissions were determined by analyzing and summarizing the monitoring results from each level.

[0119] And / or, the steps for analyzing the summarized monitoring results from each layer are as follows:

[0120] Based on the aggregated monitoring results from each level, the spatial distribution of greenhouse gases is constructed;

[0121] Decisions on optimal emission reduction pathways are made based on the spatial distribution of greenhouse gases.

[0122] And / or, the steps for analyzing the summarized monitoring results from each layer are as follows:

[0123] Based on the aggregated monitoring results from each layer, the collection efficiency of the deodorization device is estimated.

[0124] By comprehensively analyzing greenhouse gas monitoring results from underground pools, surface gas accumulation areas, open-air surface pools, and deodorization devices, it can be determined that the total emissions from the deodorization devices represent the overall level of greenhouse gas emissions. Furthermore, based on the monitoring results from surface gas accumulation areas and open-air surface pools, spatial distribution fields of CH4, N2O, and CO2 concentrations can be constructed. In actual monitoring, by combining the differences between underground pools and surface gas accumulation areas and open-air surface pools, the collection efficiency of the deodorization devices can be assessed, and the emissions of uncollected portions can be estimated. For example, if the monitoring results from underground pools are greater than the emissions from open-air surface pools, it may indicate the existence of unexpected emission pathways, requiring further confirmation. Through a spatially stratified monitoring strategy, combining multi-source monitoring data from underground observation windows, surface mobile monitoring, and deodorization devices, and employing spatial interpolation, diffusion models, and data assimilation techniques, a high-precision greenhouse gas spatial distribution function can be constructed, enabling dynamic correction of emission factors. This provides a reliable technical path for carbon metering and emission reduction optimization in wastewater treatment plants, and allows for continuous optimization of algorithm efficiency and data fusion strategies. The advantage of this method is that by integrating multi-source data, it avoids the risk of underestimation that may result from relying on a single data source in traditional methods, and can capture fugitive emissions more accurately. At the same time, the spatial distribution function helps to identify emission hotspots and helps to formulate more targeted emission reduction measures.

[0125] Example 7:

[0126] In one embodiment, the gas sampling end of the portable infrared gas analyzer is equipped with a dehumidification device.

[0127] This invention provides a method for stratified monitoring of greenhouse gases in semi-underground wastewater treatment plants, such as... Figure 2 As shown, it includes:

[0128] The stratified greenhouse gas monitoring module is used to monitor greenhouse gases in the underground pools, surface gas accumulation areas, open surface pools, and deodorization devices of a semi-underground wastewater treatment plant, and to summarize the monitoring results of each layer.

[0129] The monitoring results analysis module is used to analyze the summarized monitoring results from each level and output the analysis results.

[0130] The steps for monitoring greenhouse gases in underground pools are as follows:

[0131] The sampling end of the portable infrared gas analyzer is controlled to move downwards at a constant speed and vertically from the observation window of the underground pool.

[0132] During the movement, the depth scan of the layers accessed within the underground pool is performed at preset time intervals.

[0133] After the movement is completed, summarize the depth scan results for each layer;

[0134] Based on the aggregated depth scan results for each layer, the average concentration and instantaneous gas release rate for each layer were calculated.

[0135] The mass emission rate is calculated based on the stratified average concentration and the instantaneous gas release rate.

[0136] The steps for monitoring greenhouse gases in areas where they accumulate on the ground are as follows:

[0137] Plan the navigation routes of mobile monitoring vehicles deployed in the ground gas accumulation area;

[0138] Based on the mobile monitoring route, control the mobile monitoring vehicle to monitor greenhouse gases in areas where ground gases accumulate.

[0139] The steps for monitoring greenhouse gases in open-air ground-level pools are as follows:

[0140] Based on flux chamber monitoring, greenhouse gas emission fluxes of open-top ponds were obtained.

[0141] Calculate the greenhouse gas emissions of an open-top pond based on the greenhouse gas emission flux and the surface area of ​​the open pond.

[0142] The steps for monitoring greenhouse gases in deodorization devices are as follows:

[0143] Monitor the gas concentration, flow velocity, and cross-sectional area of ​​the pipe at the monitoring point of the straight pipe section at the outlet of the deodorization device;

[0144] Calculate the greenhouse gas emissions of the deodorization device based on gas concentration, flow rate, and pipe cross-sectional area.

[0145] The steps for analyzing the summarized monitoring results from each layer are as follows:

[0146] The total emissions were determined by analyzing and summarizing the monitoring results from each level.

[0147] The steps for analyzing the summarized monitoring results from each layer are as follows:

[0148] Based on the aggregated monitoring results from each level, the spatial distribution of greenhouse gases is constructed;

[0149] Decisions on optimal emission reduction pathways are made based on the spatial distribution of greenhouse gases.

[0150] The steps for analyzing the summarized monitoring results from each layer are as follows:

[0151] Based on the aggregated monitoring results from each layer, the collection efficiency of the deodorization device is estimated.

[0152] The portable infrared gas analyzer is equipped with a dehumidification device at its gas sampling end.

[0153] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for stratified monitoring of greenhouse gases in a semi-underground wastewater treatment plant, characterized in that, include: Greenhouse gas monitoring was conducted at different levels for the underground pools, surface gas accumulation areas, open surface pools, and deodorization devices of the semi-underground wastewater treatment plant, and the monitoring results of each level were summarized. Analyze the summarized monitoring results from each layer and output the analysis results; The steps for monitoring greenhouse gases in underground pools are as follows: The sampling end of the portable infrared gas analyzer is controlled to move downwards at a constant speed and vertically from the observation window of the underground pool. During the movement, the depth scan of the layers accessed within the underground pool is performed at preset time intervals. After the movement is completed, summarize the depth scan results for each layer; Based on the aggregated depth scan results for each layer, the average concentration and instantaneous gas release rate for each layer were calculated. The mass emission rate is calculated based on the stratified average concentration and the instantaneous gas release rate. The steps for monitoring greenhouse gases in areas where they accumulate on the ground are as follows: Plan the route for mobile monitoring vehicles deployed in the ground gas accumulation area; Based on the mobile monitoring route, control the mobile monitoring vehicle to monitor greenhouse gases in areas where ground gases accumulate; The steps for monitoring greenhouse gases in open-air ground-level pools are as follows: Based on flux chamber monitoring, greenhouse gas emission fluxes of open-top ponds were obtained. Calculate the greenhouse gas emissions from an open-top surface pond based on the greenhouse gas emission flux and the surface area of ​​the open pond. The steps for analyzing the summarized monitoring results from each layer are as follows: Analyze and summarize the monitoring results from each level to determine the total emissions; Based on the aggregated monitoring results from each layer, the spatial distribution of greenhouse gases is constructed, and the collection efficiency of the deodorization device is estimated. Decisions on optimal emission reduction pathways are made based on the spatial distribution of greenhouse gases.

2. The method for stratified monitoring of greenhouse gases in a semi-underground wastewater treatment plant as described in claim 1, characterized in that, The steps for monitoring greenhouse gases in deodorization devices are as follows: Monitor the gas concentration, flow velocity, and cross-sectional area of ​​the pipe at the monitoring point of the straight pipe section at the outlet of the deodorization device; Calculate the greenhouse gas emissions of the deodorization device based on gas concentration, flow rate, and pipe cross-sectional area.

3. The method for stratified monitoring of greenhouse gases in a semi-underground wastewater treatment plant as described in claim 1, characterized in that, The portable infrared gas analyzer is equipped with a dehumidification device at its gas sampling end.

4. A greenhouse gas stratified monitoring system for a semi-underground wastewater treatment plant, characterized in that, include: The stratified greenhouse gas monitoring module is used to monitor greenhouse gases in the underground pools, surface gas accumulation areas, open surface pools, and deodorization devices of a semi-underground wastewater treatment plant, and to summarize the monitoring results of each layer. The monitoring results analysis module is used to analyze the summarized monitoring results from each level and output the analysis results. The steps for monitoring greenhouse gases in underground pools are as follows: The sampling end of the portable infrared gas analyzer is controlled to move downwards at a constant speed and vertically from the observation window of the underground pool. During the movement, the depth scan of the layers accessed within the underground pool is performed at preset time intervals. After the movement is completed, summarize the depth scan results for each layer; Based on the aggregated depth scan results for each layer, the average concentration and instantaneous gas release rate for each layer were calculated. The mass emission rate is calculated based on the stratified average concentration and the instantaneous gas release rate. The steps for monitoring greenhouse gases in areas where they accumulate on the ground are as follows: Plan the route for mobile monitoring vehicles deployed in the ground gas accumulation area; Based on the mobile monitoring route, control the mobile monitoring vehicle to monitor greenhouse gases in areas where ground gases accumulate; The steps for monitoring greenhouse gases in open-air ground-level pools are as follows: Based on flux chamber monitoring, greenhouse gas emission fluxes of open-top ponds were obtained. Calculate the greenhouse gas emissions from an open-top surface pond based on the greenhouse gas emission flux and the surface area of ​​the open pond. The steps for analyzing the summarized monitoring results from each layer are as follows: Analyze and summarize the monitoring results from each level to determine the total emissions; Based on the aggregated monitoring results from each layer, the spatial distribution of greenhouse gases is constructed, and the collection efficiency of the deodorization device is estimated. Decisions on optimal emission reduction pathways are made based on the spatial distribution of greenhouse gases.

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